A subpoena issued in September by the U.S. Attorney’s Office to the city of Atlanta has netted federal investigators 1.2 million pages of new documents in the ongoing City Hall bribery investigation.

The subpoena asks for all contracts won by six companies associated with Jeff Jafari, who was an executive in the engineering firm The PRAD Group.

Jafari was a big supporter of former Mayor Kasim Reed and newly minted mayor Keisha Lance Bottoms, who returned $25,700 in campaign contributions from Jafari and others at his companies after The Atlanta Journal-Constitution reported on them.

A city spokeswoman said documents related to the subpoena were turned over to federal prosecutors late last year, and will be made available to the public soon. Jafari’s attorney said his dealings with the city were lawful.